Per mutation-lock



(Modem 0. A. a: s. E. JOHANNESEN.

PBRMUTATION LOOK. No. 387,789. Patented Aug. 14, 1888.

ATTORNEYS.

N. PETERS, Pnawum u hor. wnhzngton D, C.

llnrrnn STATES Parent riuce.

CONRAD ALBERT JOHANNESEN AND SVEND EMAX'UEL JOHANN SEN, OF ERIE,PENNSYLVANIA.

PERMUTATlON-LOGK.

SPECIFICATION forming part of Letters Patent No. 387,789, dated August14, 1388.

iModclJ To aZZ whom, it may concern:

Be it known that we, CONRAD ALBERT J0- HANNESEN and SVEND EMANUELJOHANNE SEN, of Erie, in the county of Erie and State of Pennsylvania,have invented a new and Improved Permutation-Lock,of which the followingis a full, clear, and exact description.

This invention relates to looks, the object of the invention being toprovide apermutatiou lock that shall be especially applicable for use asa lock for postoilice-boxes,although thelock might be used for manyother purposes.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure l is a face view of ourimproved form of lock. Fig. 2 is asectional plan view taken on line 1r of Fig. 1. Fig. 3 is a view of theinner face of the loclnparts being broken away. Fig. 4 is a detail Viewrepresenting the construction of the outer dial-plate, the springpawlplate carried by the dial-plate being shown in connectiontherewith. Fig.5 isa detail view representing the inner face of the dial-plate shown inFig. 4. Fig. 6 is a see tional View taken on line :1; y of Fig. 5. Fig.i is an outer face View of the knob and the dial-plate carried thereby.Fig. 8 is a view of the opposite side of the plate shown in Fig. 7. Fig.9 is a face View of the lock-case with the dials removed, the springpawlplate carried by the lock-case being shown in connection therewith. Fig.10 is a view of the forward face of the outer tumbler. Fig. 11 is asectional view taken on line 2 e of Fig. 10. Fig. 12 is an outer faceview of the inner tumbler. Fig. 13 isa sectional view taken on line 20 wof Fig. 12. Fig. 14 is a face view of the washer by which the tumblersare held to the spindle, and Fig. 15 is acrosssectional view of one ofthe spring-pawl plates.

The look illustrated in the drawings is carried by a frame or case, 10,that is arranged for connection with a door, preferably being formedwith lugs l1,through which retainingscrews 12 are passed. This case orframe has a central web, 13, said web being formed with a centralcircular aperture, 14.

To the outer face of the web 13 there is se cured aspring-pawl plate,15, said plate being formed with a number of upwardlyextending tonguesor pawls, 16, as shown best in Fig. 9, which tongues engage a circularset of ratchetteeth, 17, that are formed upon the under side of theouter dial-plate, 18, which diul-plate is provided with a sleeve, 19,which extends through the central opening, 14, of the case or frame 10,a tumbler, 20, being held to the sleeve 19 by a setscrew, 21, thetumbler being connected to the inner end of the sleeve, as best shown inFig. 2. A second spring-pawl plate, 15, is secured to the outer face ofthe dial-plate 18 within a central recess that is formed in the plate,and the pawls or springarms of this plate 15 engage with a circularratchet, 17, that is formed upon the inner face of a dial. 22, whichsaid dial is rigidly connected to the spindle 23 of a k nob, 24,thespiadle extending through the sleeve 19 and fitting closely therein,the extending portion of the spindle being cutaway to receive the outertumbler, 25, said tumbler being held to the spindle by a washer, 26,which tits upon a squared or irregularlyformed irojection, 27, thewasher portion being held to the spindle by a set-screw, 28, thisconstruction being adopted in order that when the set-screw is tightenedthe position of the tumbler will not be affected.

The tumbler 25 is formed with a forwardlyeXtending ring or flange, 29,the face of which is flush or parallel with that of the face of thetumbler 20. The tumblers 20 and are formed with slots 2 and 3,respectively, which slots extend inward from the peripheral edges of thetumblers. In connection with the dialplates we arrange a pointer, 30.

In setting up the lock the spring-pawl plates 15 and 15 and the circularratchets l7 and 17 are arranged in opposition, so that as the knob 24 isturned in one direction the dial-plate 18, and with it the innertumbler, 20, will be ad vanced; but when the motion imparted to the knobis reversed said dialplate and tumbler will be held in a fixed positionand the outer tumbler, 25, and its dial 22 will move. In theconstruction illustrated in the drawings, if the knob 24: be turned inthe direction of the arrow marked a the dial 155 and its tumbler IOOwill be advanced; but if the knob be turned in the direction of thearrow marked Z) the dial 22 and its tumbler will be advanced.Consequently in numbering or lettering the graduations upon the dial 22we arrange the numerals or letters so that they run from right to leftinstead of from left to right, as will be seen from an inspection ofFig. 1.

In connection with the lock above described we employ a latch whichconsists, essentially, of an outwardly'extending stud, 40, which, whenthe apertures 2 and 3 are brought into register opposite the point atwhich the stud is located, will pass through said recesses or aperturesto a point between the flange 29 of the tumbler and the web 13 of thecase or frame 10, the point of the stud extending inward, so that itrests between the face of the tumbler 20 and the said web of the case orframe. Then, if the knob 24 be turned so as to throw the recesses orapertures 2 and 3 out of register the 1 one with the other and with thestud 40, the

door or cover to which the lock is connected will be held firmly withinits casing and can:

not be opened until the two recesses or apertures have been once againbrought into rcg ister with the stud 40.

In order to bring the recesses into register with thestud 40, thecombination being known, the knob 24 is turned in the direction of thearrow a until the dial 18 is moved to proper relative position with thepointer 30. Then the motion of the knob is reversed until its dial isbrought into proper relative position with the pointer 30, as will bereadily understood from an inspection of the drawings.

When our improved form oflock is employed in connection withpostoffice-boxes, it is desirable that the postmaster should be able toopen the box-doors at will, as it frequently happens that the box-ownersforget their combinations,andtothisendweprefertoconnectthestud 40 to ashaft, 41, which extends at right angles to the stud, the shaft beingmounted in proper bearings upon which it is free to turn. To the innerend of this shaft we connecta springarm, 42, at one end of which thereis formed a catch, 43, which catch may be thrown into engagement with akeeper, 44, and when so placed the stud or arm 40 will extend outward,as illustrated in the drawings; but should the boxowner forget thecombination the postmaster has only to throw the catch 43 fromengagement with the keeper 44 and move the spring-arm outward in thedirection of the arrow shown in connection therewith in Fig. 3, whichmovement of the spring-arm will carry the stud 40 clear of the tumblers20 and 25, thus providing for the opening of the box-door.

It will of course be understood that our improved form of lock might beused in connection with safe or other doors, or that it might beemployed to lock drawers, caskets, jewelboxes, or any receptacle that itis desired to protect from the intrusion of unauthorized parties.

In order that the tumblers when operated by unauthorized persons will beapt to slip by the stud 40 as their slots are brought near said stud,weprefer to make the flange of the outer tumbler and the body of theinner tumbler slightly thinner at and near the points where the slotsare formed, for by so doing the frictional contact between the tumblersand the studis decreased as the tumblers are turned so as to bring theirslots in close proximity to the stud, and it is likely that the partywill turn the tumblers so that their slots will be carried past thestud.

Having thus fully described our invention, we claim as new and desire tosecure by Letters Patent- 1. In a permutation-lock, the combination,with two dials and tumblers arranged in connection therewith,0faspring-plate and ratchet arranged between the lock-case and the outerdial, and. an inversely-arranged spring-pawl plate and ratchet arrangedbetween the dials, substantially as described.

2. In a permutationlock, the combination, with a lock-case formed with acentral web and carrying a spring-ratchet plate, 15, of a dial formedwith a sleeve, 19, which passes through an aperture in the web-case andis provided with a ratchet upon its inner face, an inner tumbler fixedto the sleeve of the dial, an inner dial connected to the shank, anoperating-rod the shank of which passes through the sleeve 19, an outertumbler secured to the said shank, a spring-ratchet plate carried by thefirstnamed dial, and a ratchet formed upon the inner face of thelast-named dial, substantially as described.

CONRAD ALBERT JOHANNESEN. SVENI) EMANUEL JOHANNESEN;

W'itnesses:

WM. P. HAYES, O. B. HAYES.

